.detail-main {
    width: 600px;
    margin: 0 auto;
}

.submit-answer {
    text-align: right;
}

.answerer-info {
    text-align: right;
}

.answer-li {
    list-style: none;
    border-bottom: 1px solid #eee;
    padding-top: 10px;
    padding-bottom: 10px;
    overflow: hidden;

}

.answer {
    float: left;
    width: 400px;
    padding-left: 20px;

}

.ava-img {
    float: left;
}